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Sludge treatment method

A technology of sludge and dewatered sludge, which is applied in the direction of pyrolysis sludge treatment, sludge treatment, chemical instruments and methods, etc., can solve the problems that are not conducive to the development of carbonization technology, reduce dehydration efficiency, and high energy consumption of thermal drying

Pending Publication Date: 2021-09-21
北京云水浩瑞环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the water content of the first three dehydrators is basically about 80%, and the subsequent thermal drying consumes a lot of energy; the plate and frame dehydrator can reduce the water content to about 60%, but it needs to add a large amount of inorganic chemicals such as quicklime
The addition of quicklime will not only greatly reduce the organic matter content of sludge, but also form calcium hydroxide with water, which will reduce dehydration efficiency and increase carbonization energy consumption, which is extremely unfavorable for the development of carbonization technology

Method used

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Effect test

Embodiment 1

[0048] (1) Mix sludge (moisture content 97wt%) with polyacrylamide (addition amount is 5wt‰ of dry sludge), and carry out primary dehydration treatment in a centrifugal dehydrator, the obtained primary dewatered sludge Moisture content is 80.7wt%;

[0049] (2) The primary dewatered sludge is conveyed by a biaxial screw, and a flocculant ferric chloride solution is added at the front end, and the amount of the ferric chloride solution is 15wt% of the dry basis of the sludge The concentration is 38wt%;

[0050] (3) Biochar is added into the mixing system of step (2) to mix, and continue to be transported backward; the addition time of biochar is 3min later than the addition time of ferric chloride; the particle diameter of biochar is 100 orders, and the biological charcoal The amount of charcoal added is 25wt% of the sludge dry basis;

[0051] (4) After the mixed sludge is dehydrated by a high-pressure belt dehydrator, the moisture content of the obtained dewatered sludge is 6...

Embodiment 2

[0054] (1) Mix sludge (moisture content 97wt%) with polyacrylamide (addition amount is 3wt‰ of dry sludge), and perform primary dehydration treatment in an atmospheric belt dehydrator to obtain primary dehydration The moisture content of sludge is 78.4wt%;

[0055] (2) The primary dewatered sludge is transported by a biaxial screw, and a flocculant polyaluminum ferric sulfate solution is added to the front end, and the addition amount of the polyaluminum ferric sulfate solid is 8wt% of the sludge dry basis;

[0056] (3) Biochar is added into the mixing system of step (2) for mixing, and continues to be transported backward; the addition time of biochar is 5min later than the addition time of polyaluminum ferric sulfate; the particle diameter of biochar is 10 orders, and the biochar The amount of charcoal added is 40wt% of the sludge dry basis;

[0057] (4) After the mixed sludge is dehydrated by a high-pressure belt dehydrator, the moisture content of the obtained dewatered s...

Embodiment 3

[0060] (1) Mix sludge (water content 97wt%) with polyacrylamide (addition amount is 5wt‰ of sludge dry basis), and carry out primary dehydration treatment in centrifugal dehydrator, obtained primary dewatered sludge Moisture content is 81wt%;

[0061] (2) The primary dewatered sludge is conveyed by a biaxial screw, and a flocculant magnesium chloride solution is added to the front end, and the amount of magnesium chloride solid added is 12wt% of the sludge dry basis;

[0062] (3) Biochar is added into the mixing system of step (2) for mixing, and continues to be transported backward; the addition time of biochar is 3min later than the addition time of magnesium chloride; the particle size of biochar is 200 mesh, and the addition of biochar The amount is 20wt% of the sludge dry basis;

[0063] (4) After the mixed sludge is dehydrated by a high-pressure belt dehydrator, the moisture content of the obtained dewatered sludge is 60.07wt%;

[0064] (5) After the dehydrated sludge ...

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Abstract

The invention discloses a sludge treatment method, which comprises steps of (1) mixing sludge and polyacrylamide, and carrying out primary dehydration treatment to obtain primary dehydrated sludge, and (2) mixing the primary dehydrated sludge with biochar and a flocculant, conducting secondary dehydrating treatment so as to obtain dehydrated sludge. In the step (1), the water content of the sludge is 96-98 wt%, and the water content of the primary dehydrated sludge is 75-90 wt%. Therefore, the biochar is used as a coagulant aid instead of quick lime, and a basically consistent sludge dehydrating effect can be achieved. Besides, after quick lime is replaced by the biochar, the subsequent heat drying efficiency of the sludge can be remarkably improved, so that the industrial cost is remarkably reduced, the carbonization energy consumption is reduced, and the development of the carbonization technology is promoted.

Description

technical field [0001] The invention relates to the technical field of sludge regeneration treatment, in particular to a method for treating sludge. Background technique [0002] In an oxygen-free environment, pyrolysis and carbonization of organic solid waste such as sludge to prepare biochar and pyrolysis oil and gas can significantly reduce the residual volume of sludge and garbage, kill pathogenic microorganisms, decompose organic pollutants, and passivate Heavy metals in biomass can reduce the environmental risk of solid waste heavy metals, and realize the reduction, harmlessness and stabilization of sludge; the pyrolysis oil and gas produced by pyrolysis can be directly reused as system energy supply. [0003] However, the sludge has a high moisture content, so it should be dehydrated and dried first before carbonization. The current mainstream dehydration technology includes centrifugal dehydrator, screw stack dehydrator, belt dehydrator and plate and frame dehydrato...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/10C02F11/122C02F11/123C02F11/125C02F11/127C02F11/13C02F11/147C02F11/148
CPCC02F11/147C02F11/127C02F11/125C02F11/123C02F11/122C02F11/148C02F11/10C02F11/13
Inventor 刘维娜兰玉顺姜铁斌王丹
Owner 北京云水浩瑞环境科技有限公司
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